I use my 1 lumen all the time, infact my torches spend 50% of their on time at 1 lumen, probably 25% on 10 lumens, and the last 25% on max
Moonlight isn't always full on, and it doesn't get indoors too well, and when moving around just after getting up, a low low is far more comfortable to adjust to, why blast away your night vision with 100 lumens only to have to wait another minute to be able to see again. Everyone uses their torches within their own context, and I find in my use I have a need for lower lows. Maybe you don't see the need and thats fine too.
Buying a corvette where you can't go slow isn't practical. A torch that can go low, doesn't mean it can't pocket rocket! Having a range of speeds is far more useful than having just fast and too fast.
And the SOS and strobe, I don't mind having, but its all about the UI. In the nitecore D11.2, the strobe and SOS are well hidden, and I really like that. In my budget lights with memory, its IMPOSSIBLE to not go through strobe and SOS, so lets say I see something nearby and I want a quick bit of light for half a second to check it out. Medium mode is what I'm after because its too close for high mode. So when I turn the torch on, its on low, I can't really see what I'm after, so to get medium, I need to cycle through modes, Strobe, SOS, High, then I get to medium. Doing it isn't hard, its just a process that takes time, and blinding/annoying to be going through full output strobes. Do this every time you want to actually USE the torch, and the novelty quickly wears off. For this reason, the disco modes are annoying. Cycling through disco 99% of the time you use a torch because of a function that is used 1% of the time doesn't cut it for me.
Unfortunately a fair number of nice budget lights are 5 mode with memory. And sometimes the memory is of the cheaper type (measuring on time) so you end up changing modes unexpectedly, and therefore need even more cycles to get to the right level. I think many of us can appreciate the benefits of strobe and SOS, but its more often than not a case of the UI causing it to get in the way. 3 mode torches help reduce the number of clicks needed to get a particular brightness, and no memory helps again, however nicer UIs such as the nitecore PDs really allow me to enjoy the benefits of disco modes without it ever getting in the way.
SO end of the day, its a problem with the UI, not the disco modes itself. The real question to ask is, can you put up with cycling through disco modes, or pay a couple dollars more to have no disco modes at all, or pay double the price for a UI that allows both.
90% of my torches fit into the last category because it is what I value, but accordingly, my collection cannot be as numerous as what some other flashaholics have the privilege(?) of enjoying.